Septic arthritis of hip joint

 Young male patient with fever of ~5-6 weeks duration, right hip pain.

STIR Coronal : Green arrow - joint effusion, Orange arrow: asymmetric red marrow / marrow edema.
(See last MRI image also)

STIR Axial image, Grade 3 joint effusion

STIR Axial image, marked.

Thickening and enhancement of the joint capsule / synovial layers.

Ultrasound: Echogenic fluid with debris within the anterior synovial recess. Anterior peri-articular muscle edema+. Probe tenderness+.

Eventhough the T1 hypointense signals in the intertrochanteric region (left) can be explained by the presence of residual red marrow in this 20yr old patient, the signal intensity is markedly reduced on right side, suspicious of marrow edema.